Nd3+ → Yb3+ energy transfer in a codoped metaphosphate glass as a model for Yb3+ laser operation around 980 nm |
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Authors: | F Liégard J L Doualan R Moncorgé M Bettinelli |
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Institution: | (1) Centre Interdisciplinaire de Recherches Ions et Lasers, UMR 6637 CEA-CNRS-ENSICAEN, Université de Caen, 6 Boulevard Maréchal Juin, 14050 Caen, France;(2) Dipartimento Scientifico e Tecnologico, Università di Verona, Strada Le Grazie 15, 37134 Verona, Italy;(3) INSTM, UdR Verona, Ca’ Vignal, Strada Le Grazie 15, 37134 Verona, Italy |
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Abstract: | A complete spectroscopic investigation of a metaphosphate glass with composition Pb(PO3)2 doped with various amounts of Nd3+ and Yb3+ (1 up to 10 at.%) is reported. Efficient Nd3+ → Yb3+ energy transfers occur both radiatively and non-radiatively, the latter being dominant and partly resonant and partly phonon-assisted
by phonons of the order of 950 cm−1, which fits well with the reported Raman spectrum of the material. These transfers mainly concern the 4F3/2 → 4I9/2 emission and the 2F7/2 → 2F5/2 absorption transitions of the Nd3+ and Yb3+ ions around 900 nm, respectively. They are analysed both via spectral and temporal data. The results show that about 5% Nd3+ and 5% Yb3+ ions have to be incorporated to reach energy transfers exceeding about 65%, which is in agreement with data recently reported
in the case of a YAl3(BO3)4 crystal. Simulations based on the obtained data show that laser thresholds of a few tens of mW should be easily attainable
by operating the materials in a channel waveguide configuration. |
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Keywords: | 78 20 78 45 78 60 |
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